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You might check the powerhead for water leaks into the cylinders. Maybe an endoscope in the cylinders? Water leaks into the cylinders, can make it to the crankcase, possibly causing the knock. Your ign timing is correct?

Gee, so many negative vibes. Put the trailer up on ramps, like when changing your oil.

A lot of those V8 MerCruisers have a belt driven raw water pump. If may not leak when the engine is off, but leak when the engine is running.

I would not think that waterleaking from the powerhead base gasket area would affect running. That area also houses the cooling water. Is it possible it is overheating? Overheat can cause knock.

To be fair, the motor is just a bit low. If it was up a few inches, and you never plan to tilt it up, run it!

Rebuild it. The kits are cheap.

The bolts holding the powerhead on Mercs are SS lock nuts. They are not usually an issue. Breaking the powerhead loose from the midsection can be an issue. You need to lift 'em straight and with a 250+# powerhead, that can be tricky. Tilt it up, get a flashlight, take a look and maybe it...

The seal in question is the same one that goes in the outlet of the waterpump. It is a friction fit, however, it is easy to push into the waterpump with a finger, but not so easy to push it into the bottom of the exhaust extension on the top inside of the midsection. You cannot get your hand...

Amazon had a new SS one for my Merc V6 for $141. I did not see a new steel one on the web.

Check any cables that lay in the bottom of the bilge real well. On my speedboat, one of my battery cables had a nick in the insulation. That part of the cable sat in the saltwater, with a fully charged battery overnight. The next morning the battery cable in that spot was blue goo, and the...

I am not sure. The only way I can think of is to put the seal on the top end of the water tube. Now wrap some electrical tape around the water tube to hold the seal in place at the end of the tube. Tilt the motor all the way up, lube the seal with some oil and shine a flashlight up the...

That steering cable may be beyond saving. I presume it is a rotary system with the cable pulled out of the helm?

Gee, The OEM replacement for my Merc V6 was N/A for steel and $200+ for the SS replacement. Just so you know, the tilt tube on my Merc V6 has two different size nuts on it. The open end is larger than the cable side. The nuts may be unique to Mercury, so I would suggest you save yours, or get...

If you boat in salt water, the gauges can get corroded. They are usually made of a thin brass tube that moves when pressurized. The tube has a set of teeth that move a brass gear that moves the needle. Any of the movable parts can hang up, or get hard to move, affecting accuracy. I happen to...

Yes, cracks in the rubber give it away.

Do you remember when the installers used quick set epoxy to install masonry sheets in the ceiling of the "Big Dig" tunnel in Boston. The sheets with the slow set epoxy stayed in place, but the ones installed with the quick set epoxy fell onto moving cars one day causing lots of injuries. Of...

You might source a new tilt tube, just to have another option. I have no idea if they are available for your motor.

Gee, I just buy Ugly Stiks. I haven't broken one of those yet.

"Permatex Gasket Dressing and Sealant" is immune to fuel. You could put it on the threads or use a rubber washer on the screw, or both.

The gearcase should be pressurized to 10 PSI or so. Another case of AI being wrong. The driveshaft seal in the waterpump base often fails. It is easiest just to buy a new waterpump base, with the seal already installed. Clean the driveshaft with fine sandpaper and lube it with oil before...